Transformer



F 630, 93 May 1927' E. G. DANHELON 6 TRANSFORMER Filed y 27. 1924 FIE I.

A? /&

FIE-E.

Patented May 31,1921.

. UNITED STATES PATENT OFFICE. A

ERN EST G. DANIELSON, OF .SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO E. T.CUN- NINGHAM, OF SAN FRANCISCO, CALIFORNIA.

\ TRANSFORMER.

Application filed May 27, 1924. Serial No. 716,168.

This invention relates to a transformer of high frequency currents, andmore particularly to the housingof such coils.

It is one of the objects of my invention to 6 provide a. radio frequencytransformer tha-t is inexpensive in construction and neat in appearance.

It is another object of my invention to construct a radio frequencytransformer with 10 comparatively few parts to assemble, especially asregards the housing or casing.

My invention possesses other advantageous features, some of which, withthe foregoing, will be set forth at length in the following description,where I shall outline in full thatform of the invention which I haveselected for illustration in'the drawings accompanying and forming partof the present application. Although I have shown in the drawingsbut oneform of my invention I do not desire to be limited thereto, since theinvention as expressed in the claim may be embodied in other forms also.

Referring to the drawings:

Figure '1 is a main sectional view of a radio frequency transformerembodying my invention: and i I Fig. 2 is another sectional View, takenalong plane 2-2 of Fig.1.

In the'present instance, the elements of the transformer consist ofcoaXially arranged coils 11. which may be connected in any appropriatemanner to form primary or secondary windings, or even a single windingif desired. A core 12 of magnetic material is disposed so as to extendthrough all'of the coils 11 and independently support the same, and isshown as formed of a bundle of fine wires extending along the length ofthe coils.

One of the features of my invention resides in the manner in which thecore 12 and the coils 11 are supported. A base member 13, preferably ofmolded insulation material,

such as bakelite, has formed integrally therewithfa tube 14, into whichthe core 12 is placed. The cylindrical base 13 thus serves as a pedestalfor a vertically disposed core support, which is coaxial with the baseand extends upwardly therefrom. The coils 11 pass over the outsideof thetube 14, and are fastened in any appropriate manner the'reon, as by'theprovision of a snug fit between them, or'if necessary by the aid of anadhesive. It must of course be remembered that transformers such asthose illustrated are of very small sizecomparable with the size of thefigures in the drawingso that no problem exists as regards mechanicalstresses or the like. Furthermore, the wire used 111 coils 11 is ofcorrespondingly fine calibre.

. former. This 'casing'sl'ips over the base 13,

as illustrated in Fig. 1, so as to embrace the base quite closely.A'square flange 18 or the like permits the provision of severalapertures 19 for fastening the entire device to any appropriate support.To maintain the casing 17 H1 fixed relation to. the base 13, anyappropriate fastening means may be provided, such as a dowel pin 20 thatpasses through the wall of casing 17 and engages the base 13. Preferablythis casing is also made from insulation material.

The top part of casing 17 has embedded therein the bottom portions of aplurality of metallic binding posts 21. These posts are each providedwith a longitudinal aperture 22 in which the leads from the coils 11 maybe soldered. Appropriately formed bosses 23 are shown on casing 17 tothicken the material where the binding posts 21 are attached;furthermore, as is usual, washers 24. and thumb nuts 25 are provided forfacilitating electrical connection to an ex ternal circuit.

The entire coil structure presents a smooth and pleasing appearance,which is due in a great measure to the use of the smoothly roundedcasing 17 I claim:

A transformer having a circular, flanged base of molded insulationmaterial, a hollow tube coaxial With the base and extending therefromsaid tube being formed integrally with the ha'se, a core located withinthe tube, coils imlepemlei'itly supported around the tube, a casing ofmolded insulation material, :1 (-ylindricnl inner surfm-e vcooper-bitingwith the circular base, andtelescoping thereover, means for fasteningthe base ancl casing to. getl' er, and binding posts carried by thecasing.

In testimony whereof, I have hereunto set ERNEST G. DANIELSON.

my hand.

